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| author | Xiaomeng Hou <Xiaomeng.Hou@amd.com> | 2020-12-10 20:18:23 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2020-12-15 11:31:28 -0500 |
| commit | a9c210c1e5fefd621954fca50c72780bf0198327 (patch) | |
| tree | 4649af7f219380084c7867c3e2a54c6839db7a3d | |
| parent | 78d907e2b8ba89c936b7f0c3344261c653668a62 (diff) | |
| download | linux-a9c210c1e5fefd621954fca50c72780bf0198327.tar.bz2 | |
drm/amdgpu/sdma5.2: soft reset sdma blocks before setup and start sdma
Without doing the soft reset, register mmSDMA0_GFX_RB_WPTR's value could not be
reset to 0 when sdma block resumes. That would cause the ring buffer's read and
write pointers not equal and ring test fail. So add the soft reset step.
Signed-off-by: Xiaomeng Hou <Xiaomeng.Hou@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c | 39 |
1 files changed, 32 insertions, 7 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c b/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c index 39e17aae655f..5c4ac176b7e4 100644 --- a/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c @@ -807,6 +807,37 @@ static int sdma_v5_2_load_microcode(struct amdgpu_device *adev) return 0; } +static int sdma_v5_2_soft_reset(void *handle) +{ + struct amdgpu_device *adev = (struct amdgpu_device *)handle; + u32 grbm_soft_reset; + u32 tmp; + int i; + + for (i = 0; i < adev->sdma.num_instances; i++) { + grbm_soft_reset = REG_SET_FIELD(0, + GRBM_SOFT_RESET, SOFT_RESET_SDMA0, + 1); + grbm_soft_reset <<= i; + + tmp = RREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET); + tmp |= grbm_soft_reset; + DRM_DEBUG("GRBM_SOFT_RESET=0x%08X\n", tmp); + WREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET, tmp); + tmp = RREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET); + + udelay(50); + + tmp &= ~grbm_soft_reset; + WREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET, tmp); + tmp = RREG32_SOC15(GC, 0, mmGRBM_SOFT_RESET); + + udelay(50); + } + + return 0; +} + /** * sdma_v5_2_start - setup and start the async dma engines * @@ -838,6 +869,7 @@ static int sdma_v5_2_start(struct amdgpu_device *adev) msleep(1000); } + sdma_v5_2_soft_reset(adev); /* unhalt the MEs */ sdma_v5_2_enable(adev, true); /* enable sdma ring preemption */ @@ -1366,13 +1398,6 @@ static int sdma_v5_2_wait_for_idle(void *handle) return -ETIMEDOUT; } -static int sdma_v5_2_soft_reset(void *handle) -{ - /* todo */ - - return 0; -} - static int sdma_v5_2_ring_preempt_ib(struct amdgpu_ring *ring) { int i, r = 0; |